Elongation: The elongation of P355NH is minimum 20% at a thickness of less than or equal to 16mm. It measures the ability of the steel to stretch before breaking.

[ad_1] The mechanical properties of P355NH and P355GH, two grades of pressure vessel steel, are as follows:

1. Tensile Strength: The minimum tensile strength for P355NH is 490-630 MPa, while for P355GH, it is 510-650 MPa. Tensile strength is the maximum stress a material can withstand before breaking under tension.

2. Yield Strength: The minimum yield strength for P355NH is 355 MPa, while for P355GH, it is 355-510 MPa. Yield strength is the stress at which a material begins to deform plastically.

3. Elongation: The minimum elongation for both P355NH and P355GH is 20%. Elongation is a measure of a material’s ductility and is expressed as a percentage of the original length before fracture.

4. Impact Strength: P355NH and P355GH have a minimum impact strength of 27 J at -20°C. Impact strength is the ability of a material to absorb energy during an impact event.

5. Hardness: The maximum hardness for P355NH and P355GH is 240HB. Hardness is a measure of a material’s resistance to indentation or scratching.

These mechanical properties make P355NH and P355GH suitable for use in pressure vessel applications where high strength and good toughness are required. They can handle high-pressure environments and maintain their integrity even in extreme conditions.
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